nonneman



I. W. NONNEMAN.

, DIE STOCK. I APPUCATION LFD JUNE 21]. I917. 1,3Q'7,1%1. Patented June17, 1919.

2 SHEETS-SHEET 1.

I. W. NONNEMANr m5 STOCK. APPLICATION FILED JUNE 28 I917.

1 ,307, 14:]. Patented June 17, 1919.

ZSHEETS-SHEET 2.

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IRA. W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDEN COMPANY, OFWARREN, OHIO, A CORPORATION OF OHIO.

DIE-STO GK.

' Specification of Letters Patent.

Patented June 1'7, 191%).

Application filed June 28, 1917. Serial No. 177,435.

citizen of the United States, residing at, lVarren, in the county ofTrumbull and State of Ohio, have invented a certain new and usefulImprovementin Die-Stocks, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings.

This invention relates to a die stock of the type wherein the chasersrecede to enable the eflicient cutting of a tapered thread on a pipe orother article. The objectof the invention is to render the die stockvery compact and simple in construction, while effectively performingthe operation desired. The die stock is illustrated in the drawingshereof and is hereinafter more fully explained.

In the drawings, Figure 1 is a front elevation of the die stock; Fig. 2is a side elevation thereof in position on a pipe; being.

threaded; Fig. 3 is an axial section of the die stock with the pipe inplace and with the chasers just starting to cut; Fig. t is a portion ofan axial section with the chasers justfinishing the cut; Fig. 5 is aperspective view of a chaser and the cooperating tapered blocli andshifting device therefor which controls the recession; Fig. 6 is a crosssection through the rotatable frame at one of the chaser housings, asindicated by the line 66 on Fig. 1. p

In the drawings, A indicates a pipe to be threaded and a the threadformed or being formed thereon.

One member of the die stock comprises a sleeve 10 surrounding the pipeand stationarily clamped to it by suitable radial thumb screwsll.Another member of the die stock comprises a rotatable frame 20 formedwith by tapered pins carried by a ring rotatably undercut ribs 21 toprovide radial housings.

for the chasers 30, and also having sockets 22 into which extend theremovable operat ing handles 40. This member 20 has an externallythreaded sleeve portion 24 which ex tends within and engages internalthreads 12 on an extension 13 of the sleeve 10. The thread described isof the pitch which it is desired to cut on thepipe, and the effect is tocause the chasers to travel longitudinally of the pipe atthe desiredrate as the chaser frame is rotated.

To cause the chasers to recede as they travel along the pipe, I providemovable tapered abutments limiting their outermost position. 50indicates these abutments,

which are suitable blocks mounted in openings 25 in the chaser frameopposite the outer end of each chaser. The outer wall of each opening isbeveled, as shown at 26, and the abutments are correspondingly. beveledon their outer edges and bear at their inner edges against the outerends of the chasers. The inner edges of these abutment blocks areparallel with the axis of the die stock.

- To shift the tapered blocks 50, to allow the chasers to recede, Iprovide housings for the blocks in the form of slotted barrels whichoccupy cylindrically formed openings in the chaser frame and have attheir ends reduced extensions 61-. These extensions pass through and areriveted to the flange 70 of a ring '71, which is internally threaded andscrews onto an external thread 14 on the extension 13 of the stationarysleeve. The thread 14 is of much steeper pit-ch than the thread 12, sothat, as the chaser frame in its rotation travels along the pipe, due tothe thread 12, the ring 71 will be given a greater movement lengthwiseof the pipe. This causes a relative recedence of the flange 70 from thechaser frame and draws out the barrels 60 and the taper blocks 50, thusrelieving the outer ends of the chasers so that they may gradually moveoutwardly.

Fig. 3 indicates the innermost position of the chasers, at the start ofthe cutting operation, and Fig. 4 indicates the finishing position,where the ring 71 has moved relatively away from the chaser frame, andthus the withdrawn blocks 50 have allowed the chasers to move outwardly.

Heretofore the control of the recedence of the chasers has frequentlybeen effected Figs. 3 and 4E. The taper of the blocks 50 is madecorrespondingly steep so that the proper recedence of the chaser iseffected by this comparatively small longitudinal travel.

The result of a new construction is that the housings for the taperblocks at no time project to any material extent beyond the chaserframe, as shown in Fig. 3. The slight relative longitudinal movement required of the abutments enables the device to be extremely compact,occupy little space and avoid the troublesome projecting tapered pinsheretofore employed.

Having thus described my invention, what I claim is:

1. In a die stock, the combination of a rotary chaser-carrying frame,movable abutments for the chasers, each having a hearing on one sideagainst the chaser and on the other against the chaser-carrying frame, astationary member adapted to be clamped to the work, and adifferentially threaded engagement between said stationary member andthe chaser carrying frame on the one hand and between the stationarymember and the abutments on the other hand.

2. In a die stock, the combination of a rotatable chaser-carrying frame,a stationary member to which it is threaded, a member rotatable with thechaser-carrying frame and automatically movable along the stationarymember at a different rate from the chaser-carrying frame, chasers,abutments therefor each having two edges at an angle to each other, oneof said edges coacting with a chaser and the other with thechasercarrying frame, and means whereby the relative movement of saidmember to the chaser-carrying frame causes movement ofsaid abutments tocontrol the recedence of the chasers.

3. In a die stock, the combination of a frame adapted to be clampedstationarily to a pipe to be threaded, a rotary chaser-carrying framehaving a threaded engagement with the stationary frame, a membe having adifferent threaded engagement with the stationary frame, and deviceshaving an inclined engagement with the chaser-carrying frame andconnected with said member for controlling the recedence of the chasers,said devices engaging the chasers on planes parallel with the axis ofthe die stock.

4. In a die stock, the combination of a sleeve, means for clamping it toa pipe to be threaded, a rotary chaser-carrying f 'ame having a threadedengagement with said sleeve, a ring having a. threaded engage ment withthe sleeve from the engagement with the chaser frame, and blocks movableradially and longitudinally and having outer inclined edges guiding. theblocks and inner edgeswhich engage the ehasers and are at an angle tothe outer edges, and recesses controlled by the relative ntr led rthtravel of the chaser frame and said ring for shifting said blocks tocontrol the recedence of the chasers.

5. In a die stock, the combination of a frame adapted to be clamped to apipe to be threaded and having an internally threaded sleeve portion, achaser-carrying frame having an externally threaded sleeve portionengaging the internal threads mentioned, an internally threaded ringengaging the external threads on the clamped frame which are differentfrom the internal threads, tapered members individually movable in thechaser frame and forming abutments for the chasers, and means connectingthe same with said ring.

6. In a die stock, the combination of a sleeve adapted to be clamped tothe pipe to be threaded and provided with an internal thread, a chasercarrying frame having an externally threaded sleeve engaging the threadsfirst mentioned, a ring internally threaded and engaging externalthreads on the stationary sleeve, said threads being of a differentpitch from the internal threads, chasers mounted in the chaser frame,abutment blocks mounted for radial movement in the chaser frame andmeans shifted by the movement of said ring relative to thechaser-carrying frame for moving said block and thereby controlling therecedence of the chasers.

7. In a die stock, the combination of a stationary sleeve adapted to beclamped to the pipe to be threaded and provided with an internal thread,a chaser-carrying frame having an externally threaded sleeve engagingthe threads first mentioned, a ring internally threaded and engagingexternal threads on the stationary sleeve, said threads being of adifferent pitch from the internal threads, chasers mounted in the chaserframe, movable tapered abutment blocks for the chasers occupyingopenings in the chaser frame, and housings for the abutment blocksconnected with said ring. v

8. In a die stock, the combination of a rotary chaser-carrying framehaving chaser housings, radial chasers mounted in said housings, asleeve 011 said chaser frame externally threaded, a sleeve adapted'to beclamped stationarily to the work and internally threaded and engagingthe sleeve on the chaser frame, said stationary sleeve having externalthreads of different pitch from the internal threads, an internallythreaded ring engaging the external threads on the stationary sleeve,said ring being provided at a dlfi'erent pitch with a flange adjacent tothe chaser frame, and longitudinally movable tapered abutments mountedin recesses in the chaserearrying frame and bearing, against said frameand connected with; sald flange and ment of said ring and chaser frame.

relatively different move;

9. In a die stock, the combination of a rotary chaser-carrying framehaving chaser housings, chasers mounted in said housings, a sleeve onsaid chaser frame externally threaded, a stationary sleeve adapted to beclamped to the work and internally threaded and engaging the sleeve onthe chaser frame, said stationary sleeve having external threads ofdifferent pitch from the internal threads, an internally threaded ringengaging the external threads on the'stationary sleeve, said ring beingprovided with a flange adjacent to the chaser frame, tapered blocksmounted in openings in the chaser frame and seating against beveledwalls in such frame, said blocks forming abutments for the chasers, andmembers slidably engaging said blocks and connected wit-h said ring.

10. In a die stock, the combination of a rotary frame, chasers slidablymounted therein and having tapered cutting teeth at their inner ends,recesses in the frame opposite the outer ends of the chasers, blocksmounted in the recesses and having beveled outer edges engaging beveledwalls of the recesses, slotted barrels embracing said blocks andslidably occupying recesses in the chaser frame, and means for movingsaid barrels relative to the chaser frame as the threading progresses.

11. In a die stock, the combination of a rotary frame having radialhousings, chasers slidably mounted in said housings and having taperedcutting teeth at their inner ends, recesses in the frame opposite theouter ends of the chasers, blocks mounted in the recesses and havingbeveled outer edges engaging beveled walls of the recesses, slottedbarrels embracing said blocks and slidably occupying recesses in thechaser frame, a ring to which said barrels are connected, a sleeve onthe chaser frame extending within the ring, external threads on suchsleeve and internal threads on the ring of different pitch, and astationary member adapted to be clamped to the work to be threaded andhaving an extension projecting between the sleeve and ring andinternally threaded to engage the sleeve and externally threaded toengage the ring.

12. In a die stock, the combination of a chaser-carrying frame, chasersmounted therein, individual tapered abutment blocks between therespective chasers and the chasercarrying frame, and mechanism movablelongitudinally of the die stock as the chaser-carrying frame rotates,said mechanism having an operative engagement with the said taperedblocks which allows them to travel radially as they are movedlongitudinally.

13. In a die stock, the combination of a chaser-carrying frame, chasersmounted therein, individual abutment blocks for the respective chasershaving on their outer edges a beveled engagement with the chasercarryingframe and on their inner edges an engagement parallel with the die-stockaxis with the chasers, and mechanism movable longitudinally of the diestock as the chaser-carrying frame rotates, said mechanism having anoperative engagement with thesaid abutment blocks which allows them totravel radially as they are moved longi tudinally.

In testimony whereof I hereunto atiix my signature.

IRA W. NONNEMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

